12581378523 has 144 divisors (see below), whose sum is σ = 22968865920. Its totient is φ = 6595852032.

The previous prime is 12581378507. The next prime is 12581378569. The reversal of 12581378523 is 32587318521.

12581378523 is a `hidden beast` number, since 1 + 2 + 58 + 1 + 3 + 78 + 523 = 666.

It is not a de Polignac number, because 12581378523 - 2⁴ = 12581378507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12581376523) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 40981536 + ... + 40981842.

Almost surely, 2^12581378523 is an apocalyptic number.

12581378523 is a deficient number, since it is larger than the sum of its proper divisors (10387487397).

12581378523 is a wasteful number, since it uses less digits than its factorization.

12581378523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 476 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 12581378523 in words is "twelve billion, five hundred eighty-one million, three hundred seventy-eight thousand, five hundred twenty-three".